Quicksort is a type of sorting algorithm, quicksort algorithm is based on divide and conquers approach, In this article, i will explain quicksort algorithm with example.

**ALGORITHM:**

**Quicksort(a[**

*l*..

*r*])

//Sorts a subarray by quicksort

//Input: Subarray A[0….n-1]

*,*defined by its left and right
// indices

*l*and*r*
//Output: Subarray

*A*[*l..r*] sorted order**if**

*l < r*

*S*←

*Partition*

*(A*[

*l..r*]

*)*//

*s*is a split position

*Quicksort*

*(A*[

*l..s*− 1]

*)*

*Quicksort*

*(A*[

*s*+ 1

*..r*]

*)*

**Solving Quicksort problem There are 4 condition:**

1. A [P] > i

2. A [P] < j

3. if (a<j)

Swap A[i] and A[j]

Else

4. Swap A[j] and A[p]

**Example:**

5 2 1 6

Pivot element is = 5

I is = 5

J is = 6

**P is a Pivot element**

**i position is 0**

**j position is n-1**

**First check the first condition [A [i] > p] i++**

**Initially I position is zero**

**For ex :**

**[A [5] > 5] “Condition False” i++**

**[A [5] > 2] “Condition False” i++**

**[A [5] > 1] “Condition False” i++**

**[A [5] > 6] “True” stop incrementing**

**Second condition [A [p] < j] j—**

**Initially j position is n-1**

**[A [6] < 5] “False” j—**

**[A [1] < 5] “true” stop decrementing**

**Check “if(i<j)” Swap [A [i] and A [j] ]**

**(6 < 1) “False”**

**Else**

**Swap [A [j] and A[p]]**

**Now it becomes**

1 2 5 6

The Same rule applied for all the problem of the quicksort. I hope you should understand correctly if you face any problem the comment in the comment section

## 2 Comments

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